Devanagari postfix: Remove duplicates because of vocalics
Devanagari postfix: Smaller table but super-annoying
to insert viraama explicitly.

There is no external dependency at all! No need of
Python script or the huge 1000+ lines of lookup table.

I see no other way than to insert the complete table as before.
Will come in next commit.
Devanagari postfix: Reverted back to Python-generated lookup table.
Devanagari postfix: Pure Elisp implementation for generating mapping table

No need of Python script anymore. Hence deleted its
generated output .el file. But retaining .py for now.
Devanagari Postfix: Use colon notation for rr. ambiguity

Instead of standalone A, AA, U, UU, etc. the ISO15919
recommends using colon to resolve ambiguity.
For ex:  grr. = गॄ  but gr:r. = ग्रृ

A, AA, U, UU, etc. are not removed coz they are harmless